The term "Holy Father" occurs only once in the Bible. It comes from the lips of Jesus as he prayed to his Father in John 17. Verse 11 says, "I am no longer in the world; and yet they themselves are in the world, and I come to You. Holy Father, keep them in Your name, the name which You have given Me, that they may be one even as We are."
It is clear that it is only to be used when refering to God the Father. The Roman Catholic religion blasphemes the title by daring to call the "pope" by that name. It must never be used for a mere human being. Besides, Jesus said, "call no one father" (Matt 23:9)